Lake Lorelei Dam Reservoir Report

Last Updated: December 5, 2025

Lake Lorelei Dam, located in Blowville, Ohio, is a privately owned structure designed by Thomas B.


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Summary

Underwood & Associates, with completion dating back to 1968. This earth dam stands at a height of 41.8 feet and serves primarily for recreational purposes, boasting a maximum storage capacity of 3150 acre-feet and a normal storage level of 1679.2 acre-feet. Situated on Glady Run, the dam covers a surface area of 155 acres and has a drainage area of 5.24 square miles.

Managed and regulated by the Ohio Department of Natural Resources, Lake Lorelei Dam has been deemed to have a significant hazard potential, yet a satisfactory condition assessment was last reported in March 2019. The dam's inspection frequency is set at 5 years, with the last inspection conducted in March 2019. While specific details regarding spillway type and outlet gates are not provided, the dam's maximum discharge capacity is recorded at 10893 cubic feet per second.

Enthusiasts of water resources and climate will find Lake Lorelei Dam to be an intriguing structure within the picturesque landscape of Brown County, Ohio. With its rich history dating back over five decades and its vital role in providing recreational opportunities and water storage, this dam stands as a symbol of human ingenuity and engineering prowess in managing and harnessing the power of natural resources for the benefit of local communities and the environment.

Year Completed

1968

Dam Length

1072

Dam Height

41.8

River Or Stream

GLADY RUN

Primary Dam Type

Earth

Surface Area

155

Drainage Area

5.24

Nid Storage

3150

Hazard Potential

Significant

Nid Height

42
       
Seasonal Comparison

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Dam Data Reference

Condition Assessment

Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.

Hazard Potential Classification

High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.